[SPARC64]: Add initial code to twiddle %gl on trap entry/exit.

Instead of setting/clearing PSTATE_AG we have to change
the %gl register value on sun4v.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 2 deletions

diff --git a/arch/sparc64/kernel/etrap.S b/arch/sparc64/kernel/etrap.S
index f2556146a735..4d644949ad49 100644
--- a/arch/sparc64/kernel/etrap.S
+++ b/arch/sparc64/kernel/etrap.S
@@ -102,7 +102,14 @@ etrap_save:	save	%g2, -STACK_BIAS, %sp
 2:              mov     %g4, %l4
                 mov     %g5, %l5
                 add     %g7, 4, %l2
-                wrpr    %g0, ETRAP_PSTATE1, %pstate
+
+                /* Go to trap time globals so we can save them.  */
+661:            wrpr    %g0, ETRAP_PSTATE1, %pstate
+                .section .gl_1insn_patch, "ax"
+                .word   661b
+                SET_GL(0)
+                .previous
+
                 stx     %g1, [%sp + PTREGS_OFF + PT_V9_G1]
                 stx     %g2, [%sp + PTREGS_OFF + PT_V9_G2]
                 sllx    %l7, 24, %l7
@@ -195,9 +202,15 @@ etraptl1:	/* Save tstate/tpc/tnpc of TL 1-->4 and the tl register itself.
                 rdpr    %tt, %g3
                 stx     %g3, [%g2 + STACK_BIAS + 0x78]
 
-                wrpr    %g1, %tl
                 stx     %g1, [%g2 + STACK_BIAS + 0x80]
 
+                wrpr    %g0, 1, %tl
+661:            nop
+                .section .gl_1insn_patch, "ax"
+                .word   661b
+                SET_GL(1)
+                .previous
+
                 rdpr    %tstate, %g1
                 sub     %g2, STACKFRAME_SZ + TRACEREG_SZ - STACK_BIAS, %g2
                 ba,pt   %xcc, 1b